package com.nowcoder.mycommunity.service;

import com.nowcoder.mycommunity.dao.LoginTicketMapper;
import com.nowcoder.mycommunity.dao.UserMapper;
import com.nowcoder.mycommunity.entity.LoginTicket;
import com.nowcoder.mycommunity.entity.User;
import com.nowcoder.mycommunity.util.CommunityConstant;
import com.nowcoder.mycommunity.util.CommunityUtil;
import com.nowcoder.mycommunity.util.MailClient;
import com.nowcoder.mycommunity.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

@Service
public class UserService implements CommunityConstant {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private MailClient mailClient;

    @Autowired
    private TemplateEngine templateEngine;

    @Autowired
    private RedisTemplate redisTemplate;

//    @Autowired
//    LoginTicketMapper loginTicketMapper;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    public User findUserById(int id) {

//        return userMapper.selectById(id);
        User user = getCache(id);
        if (user == null){
            user = initCache(id);
        }
        return user;
    }

    public Map<String,Object> register(User user){
        Map<String,Object> map = new HashMap<>();

        //判断用户
        if (user == null) {
            throw new IllegalArgumentException("参数不能为空!");
        }
        if (StringUtils.isBlank(user.getUsername())) {
            map.put("usernameMsg","账号不能为空!");

        }
        if (StringUtils.isBlank(user.getPassword())) {
            map.put("passwordMsg","密码账号不能为空!");

        }
        if (StringUtils.isBlank(user.getEmail())) {
            map.put("emailMsg","邮箱不能为空!");

        }

        User u = userMapper.selectByName(user.getUsername());
        if (u != null) {
            map.put("usernameMsg","用户已存在!");

        }

         u = userMapper.selectByEmail(user.getEmail());
        if (u != null) {
            map.put("emailMsg","该邮箱已被注册了!");
        }
        if (!map.isEmpty()) {
            return map;
        }

        //注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0,5));
        user.setPassword(CommunityUtil.md5(user.getPassword()+user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID().substring(0,6));
        user.setHeaderUrl(String.format("https://images.nowcoder.com/head/%dt.png",new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);

        //发送邮件
        Context context = new Context();
        context.setVariable("username",user.getUsername());
        //http://localhost:8080/community/activation/101/code
        String url = domain+contextPath+"/activation/"+user.getId()+"/"+user.getActivationCode();
        context.setVariable("url",url);
        String content = templateEngine.process("/mail/activation", context);
        mailClient.sendMail(user.getEmail(),"激活账号",content);
        return map;
    }

    //激活业务
    public int activation(int userId,String code){
        User user = userMapper.selectById(userId);
        if (user.getStatus() == 1){
            return ACTIVATION_REPEAT;
        }else if (user.getActivationCode().equals(code)){
            userMapper.updateStatus(userId,1);

            //清理缓存
            clearCache(userId);

            return ACTIVATION_SUCCESS;
        }else{
            return ACTIVATION_FAILURE;
        }
    }

    //登录业务
    public Map<String,Object> login(String username,String password, int expiredSeconds){
        Map<String,Object> map = new HashMap<>();

        //空值处理
        if (StringUtils.isBlank(username)) {
            map.put("usernameMsg","账号不能为空!");
            return map;
        }

        if (StringUtils.isBlank(password)) {
            map.put("passwordMsg","密码不能为空!");
            return map;
        }

        //验证账号
        User user = userMapper.selectByName(username);
        if (user == null) {
            map.put("usernameMsg","该账号不存在！");
            return map;
        }
        if (user.getStatus() == 0){
            map.put("usernameMsg","该账号未激活！");
            return map;
        }

        //验证密码
        password = CommunityUtil.md5(password+user.getSalt());
        if (!password.equals(user.getPassword())) {
            map.put("passwordMsg","密码不正确！");
            return map;
        }

        //登录成功，生成登录凭证
        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis()+expiredSeconds * 1000));
//        loginTicketMapper.insertLoginTicket(loginTicket);

        //生成ticketKey,把ticket存入redis
        String ticketKey = RedisKeyUtil.getTiketKey(loginTicket.getTicket());
        redisTemplate.opsForValue().set(ticketKey, loginTicket);


        map.put("ticket",loginTicket.getTicket());
        return map;
    }

    public void logout(String ticket) {
//        loginTicketMapper.updateStatus(ticket, 1);
        String ticketKey = RedisKeyUtil.getTiketKey(ticket);
       LoginTicket loginTicket = (LoginTicket) redisTemplate.opsForValue().get(ticketKey);
       loginTicket.setStatus(1);
       redisTemplate.opsForValue().set(ticketKey,loginTicket);
    }

    public LoginTicket findLoginTicket(String ticket) {
//        return loginTicketMapper.selectByTicket(ticket);

        String ticketKey = RedisKeyUtil.getTiketKey(ticket);
        return (LoginTicket) redisTemplate.opsForValue().get(ticketKey);
    }


    //更新头像
    public int updateHeader(int userId, String headurl){
//       return userMapper.updateHeader(userId,headurl);

        int rows = userMapper.updateHeader(userId,headurl);
        //清理缓存
        clearCache(userId);
        return rows;
    }

    public User findUserByName(String username){
        return userMapper.selectByName(username);
    }

    //以下是redis优化代码
    //1,从缓存中取值
    private User getCache(int userId){
        String userKey = RedisKeyUtil.getUserKey(userId);
        return (User) redisTemplate.opsForValue().get(userKey);
    }

    //2.缓存取不到时则初始化缓存
    private User initCache(int userId){
        User user = userMapper.selectById(userId);

        String userKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.opsForValue().set(userKey,user,3600, TimeUnit.SECONDS);
        return user;
    }

    //3，数据变更时则删除缓存数据
    private void clearCache(int userId) {
        String userKey = RedisKeyUtil.getUserKey(userId);

        redisTemplate.delete(userKey);
    }
}
